Trophy base



FIG. 1 is a front elevational view of a trophy base according to my design, the rear elevational view being identical;

FIG. 2 is a right side elevational view thereof, the left side elevational view being identical;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a trophy base, substantially as shown and described. 